Adding upstream version 1.2.6.upstream/1.2.6upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 210 insertions, 0 deletions

diff --git a/src/expr/lookup.c b/src/expr/lookup.c
new file mode 100644
index 0000000..a06c338
--- /dev/null
+++ b/src/expr/lookup.c
@@ -0,0 +1,210 @@
+/*
+ * (C) 2012-2013 by Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This code has been sponsored by Sophos Astaro <http://www.sophos.com>
+ */
+
+#include "internal.h"
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h> /* for memcpy */
+#include <arpa/inet.h>
+#include <errno.h>
+#include <libmnl/libmnl.h>
+#include <linux/netfilter/nf_tables.h>
+#include <libnftnl/rule.h>
+#include <libnftnl/expr.h>
+
+struct nftnl_expr_lookup {
+	enum nft_registers	sreg;
+	enum nft_registers	dreg;
+	char			*set_name;
+	uint32_t		set_id;
+	uint32_t		flags;
+};
+
+static int
+nftnl_expr_lookup_set(struct nftnl_expr *e, uint16_t type,
+			  const void *data, uint32_t data_len)
+{
+	struct nftnl_expr_lookup *lookup = nftnl_expr_data(e);
+
+	switch(type) {
+	case NFTNL_EXPR_LOOKUP_SREG:
+		memcpy(&lookup->sreg, data, sizeof(lookup->sreg));
+		break;
+	case NFTNL_EXPR_LOOKUP_DREG:
+		memcpy(&lookup->dreg, data, sizeof(lookup->dreg));
+		break;
+	case NFTNL_EXPR_LOOKUP_SET:
+		lookup->set_name = strdup((const char *)data);
+		if (!lookup->set_name)
+			return -1;
+		break;
+	case NFTNL_EXPR_LOOKUP_SET_ID:
+		memcpy(&lookup->set_id, data, sizeof(lookup->set_id));
+		break;
+	case NFTNL_EXPR_LOOKUP_FLAGS:
+		memcpy(&lookup->flags, data, sizeof(lookup->flags));
+		break;
+	default:
+		return -1;
+	}
+	return 0;
+}
+
+static const void *
+nftnl_expr_lookup_get(const struct nftnl_expr *e, uint16_t type,
+			 uint32_t *data_len)
+{
+	struct nftnl_expr_lookup *lookup = nftnl_expr_data(e);
+
+	switch(type) {
+	case NFTNL_EXPR_LOOKUP_SREG:
+		*data_len = sizeof(lookup->sreg);
+		return &lookup->sreg;
+	case NFTNL_EXPR_LOOKUP_DREG:
+		*data_len = sizeof(lookup->dreg);
+		return &lookup->dreg;
+	case NFTNL_EXPR_LOOKUP_SET:
+		*data_len = strlen(lookup->set_name) + 1;
+		return lookup->set_name;
+	case NFTNL_EXPR_LOOKUP_SET_ID:
+		*data_len = sizeof(lookup->set_id);
+		return &lookup->set_id;
+	case NFTNL_EXPR_LOOKUP_FLAGS:
+		*data_len = sizeof(lookup->flags);
+		return &lookup->flags;
+	}
+	return NULL;
+}
+
+static int nftnl_expr_lookup_cb(const struct nlattr *attr, void *data)
+{
+	const struct nlattr **tb = data;
+	int type = mnl_attr_get_type(attr);
+
+	if (mnl_attr_type_valid(attr, NFTA_LOOKUP_MAX) < 0)
+		return MNL_CB_OK;
+
+	switch(type) {
+	case NFTA_LOOKUP_SREG:
+	case NFTA_LOOKUP_DREG:
+	case NFTA_LOOKUP_SET_ID:
+	case NFTA_LOOKUP_FLAGS:
+		if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+			abi_breakage();
+		break;
+	case NFTA_LOOKUP_SET:
+		if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
+			abi_breakage();
+		break;
+	}
+
+	tb[type] = attr;
+	return MNL_CB_OK;
+}
+
+static void
+nftnl_expr_lookup_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
+{
+	struct nftnl_expr_lookup *lookup = nftnl_expr_data(e);
+
+	if (e->flags & (1 << NFTNL_EXPR_LOOKUP_SREG))
+		mnl_attr_put_u32(nlh, NFTA_LOOKUP_SREG, htonl(lookup->sreg));
+	if (e->flags & (1 << NFTNL_EXPR_LOOKUP_DREG))
+		mnl_attr_put_u32(nlh, NFTA_LOOKUP_DREG, htonl(lookup->dreg));
+	if (e->flags & (1 << NFTNL_EXPR_LOOKUP_SET))
+		mnl_attr_put_strz(nlh, NFTA_LOOKUP_SET, lookup->set_name);
+	if (e->flags & (1 << NFTNL_EXPR_LOOKUP_SET_ID))
+		mnl_attr_put_u32(nlh, NFTA_LOOKUP_SET_ID,
+				 htonl(lookup->set_id));
+	if (e->flags & (1 << NFTNL_EXPR_LOOKUP_FLAGS))
+		mnl_attr_put_u32(nlh, NFTA_LOOKUP_FLAGS, htonl(lookup->flags));
+}
+
+static int
+nftnl_expr_lookup_parse(struct nftnl_expr *e, struct nlattr *attr)
+{
+	struct nftnl_expr_lookup *lookup = nftnl_expr_data(e);
+	struct nlattr *tb[NFTA_LOOKUP_MAX+1] = {};
+	int ret = 0;
+
+	if (mnl_attr_parse_nested(attr, nftnl_expr_lookup_cb, tb) < 0)
+		return -1;
+
+	if (tb[NFTA_LOOKUP_SREG]) {
+		lookup->sreg = ntohl(mnl_attr_get_u32(tb[NFTA_LOOKUP_SREG]));
+		e->flags |= (1 << NFTNL_EXPR_LOOKUP_SREG);
+	}
+	if (tb[NFTA_LOOKUP_DREG]) {
+		lookup->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_LOOKUP_DREG]));
+		e->flags |= (1 << NFTNL_EXPR_LOOKUP_DREG);
+	}
+	if (tb[NFTA_LOOKUP_SET]) {
+		lookup->set_name =
+			strdup(mnl_attr_get_str(tb[NFTA_LOOKUP_SET]));
+		if (!lookup->set_name)
+			return -1;
+		e->flags |= (1 << NFTNL_EXPR_LOOKUP_SET);
+	}
+	if (tb[NFTA_LOOKUP_SET_ID]) {
+		lookup->set_id =
+			ntohl(mnl_attr_get_u32(tb[NFTA_LOOKUP_SET_ID]));
+		e->flags |= (1 << NFTNL_EXPR_LOOKUP_SET_ID);
+	}
+	if (tb[NFTA_LOOKUP_FLAGS]) {
+		lookup->flags = ntohl(mnl_attr_get_u32(tb[NFTA_LOOKUP_FLAGS]));
+		e->flags |= (1 << NFTNL_EXPR_LOOKUP_FLAGS);
+	}
+
+	return ret;
+}
+
+static int
+nftnl_expr_lookup_snprintf(char *buf, size_t remain,
+			   uint32_t flags, const struct nftnl_expr *e)
+{
+	struct nftnl_expr_lookup *l = nftnl_expr_data(e);
+	int offset = 0, ret;
+
+	ret = snprintf(buf, remain, "reg %u set %s ", l->sreg, l->set_name);
+	SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+
+	if (e->flags & (1 << NFTNL_EXPR_LOOKUP_DREG)) {
+		ret = snprintf(buf + offset, remain, "dreg %u ", l->dreg);
+		SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+	}
+
+	if (e->flags & (1 << NFTNL_EXPR_LOOKUP_FLAGS)) {
+		ret = snprintf(buf + offset, remain, "0x%x ", l->flags);
+		SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+	}
+
+	return offset;
+}
+
+static void nftnl_expr_lookup_free(const struct nftnl_expr *e)
+{
+	struct nftnl_expr_lookup *lookup = nftnl_expr_data(e);
+
+	xfree(lookup->set_name);
+}
+
+struct expr_ops expr_ops_lookup = {
+	.name		= "lookup",
+	.alloc_len	= sizeof(struct nftnl_expr_lookup),
+	.max_attr	= NFTA_LOOKUP_MAX,
+	.free		= nftnl_expr_lookup_free,
+	.set		= nftnl_expr_lookup_set,
+	.get		= nftnl_expr_lookup_get,
+	.parse		= nftnl_expr_lookup_parse,
+	.build		= nftnl_expr_lookup_build,
+	.output		= nftnl_expr_lookup_snprintf,
+};